Merge pull request #8 from railscltgroup/jwt-update

bump jwt version

Author: btyy77c

firebase_ruby_auth.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/railscltgroup/firebase_auth'
   s.license     = 'MIT'
 
-  s.add_dependency('jwt', '~> 2.2.1')
+  s.add_dependency('jwt', '~> 2.2.2')
 
   s.add_development_dependency('activesupport', '~> 5.2.3')
   s.add_development_dependency('rspec-core', '~> 3.8.0')